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The traditional ortho-rectification technique for remotely sensed imagery, which is performed on the basis of ground image processing platform, has been unable to meet the timeliness requirements. To solve this problem, this paper presents the research on ortho-rectification technique based on field programmable gate array (FPGA) platform, which can be implemented onboard and spaceborne for a real-time...
The positioning technology is one of the most important technologies in the wireless sensor network. The paper describes the current international positioning on several existing technologies, including the based ranging RSSI, TOA, TDOA, etc. and non-centroid algorithm based on distance, Amorphous algorithm, APIT algorithm and so on. Dv_Hop algorithm is a distributed localization algorithm based on...
This paper presents a FPGA (Field Programmable Gate Array)-based remotely sensed imagery denoising method, named FPGA-based median filtering. The proposed method is capable of processing large volume data since it takes full advantages of FPGA hardware and abundant logic units. This paper first overviews the traditional median filtering algorithm, and then highlights the FPGA-based filtering, including...
Currently, it is not adequate to extract and classify the hyperspectral image for oil and gas exploration. For mining the deeper remote sensing data about hydrocarbon microseepage, the technology of spectral unmixing can extract pure surface information and provide each pixel's endmember abundance. However, endmember extraction is the key of spectral unmixing. The paper mainly researches a valid algorithm,...
On the basis of exemplar-based inpaiting, an adaptive template direction algorithm was proposed to solve the problem that Criminisi algorithm easily leads to mismatching problems in the process of searching the best match patch. The selection of the direction of the template matching may raise the success rate of finding the best match patch and prevent mismatches. Experiments show that this algorithm...
There are different approaches in defining instantaneous frequency in the literature; however, with a great variety of practical problems a specific approach is not always applicable. This paper proposes a new type instantaneous frequency suitable for a large class of signals called simple wave. The new instantaneous frequency is called -counting instantaneous frequency (IF) that should have...
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